From 1bd90ff5a11fdb79eb865173d2bf4b5e25d95679 Mon Sep 17 00:00:00 2001
From: Sascha Hauer <s.hauer@pengutronix.de>
Date: Thu, 19 Apr 2012 20:12:56 +0200
Subject: mtd: implement mtd_lock and mtd_unlock

Needed for NOR flashes.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/mtd/core.c      | 37 +++++++++++++++++++++++++++++++++++++
 include/linux/mtd/mtd.h |  2 ++
 2 files changed, 39 insertions(+)

diff --git a/drivers/mtd/core.c b/drivers/mtd/core.c
index e852fb6b4..4ddf9d1bc 100644
--- a/drivers/mtd/core.c
+++ b/drivers/mtd/core.c
@@ -95,6 +95,20 @@ static int mtd_op_erase(struct cdev *cdev, size_t count, loff_t offset)
 
 	return 0;
 }
+
+static ssize_t mtd_op_protect(struct cdev *cdev, size_t count, loff_t offset, int prot)
+{
+	struct mtd_info *mtd = cdev->priv;
+
+	if (!mtd->unlock || !mtd->lock)
+		return -ENOSYS;
+
+	if (prot)
+		return mtd_lock(mtd, offset, count);
+	else
+		return mtd_unlock(mtd, offset, count);
+}
+
 #endif /* CONFIG_MTD_WRITE */
 
 int mtd_ioctl(struct cdev *cdev, int request, void *buf)
@@ -161,6 +175,28 @@ int mtd_ioctl(struct cdev *cdev, int request, void *buf)
 	return ret;
 }
 
+int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
+{
+	if (!mtd->lock)
+		return -EOPNOTSUPP;
+	if (ofs < 0 || ofs > mtd->size || len > mtd->size - ofs)
+		return -EINVAL;
+	if (!len)
+		return 0;
+	return mtd->lock(mtd, ofs, len);
+}
+
+int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
+{
+	if (!mtd->unlock)
+		return -EOPNOTSUPP;
+	if (ofs < 0 || ofs > mtd->size || len > mtd->size - ofs)
+		return -EINVAL;
+	if (!len)
+		return 0;
+	return mtd->unlock(mtd, ofs, len);
+}
+
 int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs)
 {
 	if (!mtd->block_isbad)
@@ -206,6 +242,7 @@ static struct file_operations mtd_ops = {
 #ifdef CONFIG_MTD_WRITE
 	.write  = mtd_op_write,
 	.erase  = mtd_op_erase,
+	.protect = mtd_op_protect,
 #endif
 	.ioctl  = mtd_ioctl,
 	.lseek  = dev_lseek_default,
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index c1760de10..3892bed0f 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -257,6 +257,8 @@ static inline void mtd_erase_callback(struct erase_info *instr)
 }
 #endif
 
+int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
+int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
 int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs);
 int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs);
 
-- 
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